Understand that high and low temperature test chambers know that the refrigeration system is the core of high and low temperature test chambers. The knowledge about refrigeration systems has always been a common problem. This chapter explains the high and low temperature test chambers in detail:
The medium temperature refrigerant used in the single-stage refrigeration cycle in the high and low temperature test chamber is R404A. The evaporation temperature is -46.5 °C at one atmosphere, but the heat transfer temperature difference of the air-cooled condenser is usually about 10 °C, that is, the box. Only low temperature of -36.5 °C can be obtained. If lower temperature is required due to test requirements, the minimum evaporation temperature of R404A refrigerant can be reduced to -50 °C by lowering the evaporation pressure of the compressor.
For any refrigerant, the lower the evaporation temperature, the lower the evaporation pressure; when the evaporation temperature is too low, some common refrigerants have reached the solidification temperature, and the refrigerant flow cannot be achieved, and the circulation; the evaporation pressure reduces the volume of the refrigerant. Increasing, the mass flow rate of the refrigerant is reduced. If the required cooling capacity is required, the suction volume must be increased to make the compressor volume too large;
The high and low temperature test chambers are cooled and dehumidified by the refrigeration system. The same system can make the machine reach two different states. The parameter setting and test methods are user-definable, so the rational use of the system is as follows. The operation manual or the operation video provided by Shanghai Shangyu will be easy to use.
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